Drier-felt for paper-machines.



No. 636,482. 4Patented Nov. 7, |899.

W. L. BAHRELL. DRYER FELT FOR PAPE|`1| MACHINES.

(Application led Apr. 12, 1897.) (Specmans.)

MB .E Wlwglarrell,

@MW y M UNITED STATES PATENT OEEIcE.

WILLIAM L. BARRELL, OF LAWRENCE, MASSACHUSETTS.

DRIER-FELT FOR PAPER-MACHINES.

SPECIFICATION forming part of Letters Patent No. 636,482, dated November7, 1899.

Application iilecl April 12, 1 897.

To all whom it may concern/.1

Be it known that I, WILLIAM L. BAREELL, of Lawrence, in the county ofEssex and State of Massachusetts, have invented an Improvement inDrier-Felts for Paper-Machines,of which the following description, inconnection with the accompanying drawings, is a speciiication,likeletters on the drawings representing like parts.

In paper-machines it is usual to employ a drier-felt made as a strongclosely-woven textile fabric as an apron or carrier to support the dampnew web of paper as it comes in a still soft condition from the wetwoolen felt, the drier-felt holding the paper-web firmly and smoothlyagainst the heated metal driercylinders, around and over which the webpasses until dried and ready for the calenderrolls. Only one side of thedrier felt or apron 4 comes in contact with the damp web of paper,through which the heat from the driers passes, and the action of thedampness and heat in a very short time rots the fabric of the drierfeltand burns holes therein, rendering it worthless, so that it must bediscarded. The burning and rotting of the fabric act upon and loosensthe warp-threads,leavin g a jagged or irregular depression or hole inthe surface, into which the soft moist paper will press, causingwart-like bunches or excrescences on the finished web and eitherspoiling it or greatly reducing its value.

In my efforts to improve the construction of drier-felts and increasethe life thereof I have discovered thata double-ply fabric composed oftwo plies of woven fabric each complete in itself, superposed one uponthe other and connected by binder-warps smaller than the face-warps ofthe plies, will accomplish the desired object, the binder-warps being soburied by and between the face -Warps that the latter may besubstantially burned off without separation of the plies, one of thesaid plies continuing to serve as a protector for the other.-

Figure 1 is a plan view, on an enlarged scale, of a drier-felt embodyingmy invention, the warp-threads being separated at one corner. Fig. 2 isa longitudinal sectional View of the fabric, taken on the line @c nc,Fig. l; and Fig. 3 is a diagrammatic View, in side elevation, of aportion of the drying-cylinder of Serial No. 631,725. (Specimens.)

a paper-machine, showing the drier-felts and the paper-web.

-Referring to Fig. 3, the heated drying-cylinders D D are so arrangedthat the webW of damp soft paper will as it leaves the wet woolen feltpass over and around one after another of said cylinders or driers,Idler-rolls d d are arranged, as shown, relatively to thedrying-cylinders, and endless drier felts or aprons F F' pass aroundthem in such manner as to press the web W firmly and smoothly againstthe drying-cylinders. It will be seen that the same face of thedrier-felt is always brought into contact with the damp paper and thatthe rotting action of the dampness and heat acts upon the face next thepaper, so that when in the ordinary felt a warp-thread is started thehole or depression will soon extend in area, and the fabric must bediscarded after a very short time.

My novel drier-felt is shown most clearly as to its structure in Fig. 2,and consists of two superposed plies A and B, composed, respectively, ofwarp a'nd lling threads a a.' and b b', each ply being in itself acomplete double-faced woven fabric, both the iilling and warp threadsbeing preferably of cotton. The two plies of fabric are woven in anyusual manner on a suitable loom, and in the process of weaving smalleror finer binder-warps c c' are introduced, each of which passes around afilling-thread of one ply, through the other ply, around the next pickof filling therein, then up and around the succeeding filling of thefirst ply. In this manner each binderwarp passes around every otherfilling-thread in either ply adjacent the inner or under sides of theface-warps, and successive binder- Warps cross each other, as it were,as clearly shown in Fig. 2, so that the two plies are Iirmly boundtogether. The binder-warps are much finer than the body or face warps,so that the latter extend considerably beyond and bury the binder-warpsbetween and under them, and in actual practice the binderwarps are thuscovered or concealed, owing to the lateral spread of the face-warps andthe greater tension to which the binder-warps are subjected in weaving.A large number of binder-warps are employed, and they may be .used onefor each face-warp, one for every two face-warps, as shown in Fig. l, orother- IOO wise, according to the size of the drier-felt, the diameterof the face-warps, 85o.

By using my novel drier-felt the entire ply next the web of paper may beentirely or substantially burned out or used up, the burned threadsserving as a protection to the other ply, to which they are irmlyattached by the protected binder-threads, and the felt will remainserviceable until the outer ply becomes burned out and begins to fallapart. It will be seen that the ply next the heat and paper protects theouter ply, and even when after a time the warp-threads of the former areburned off in places still the numerous binderwarps will prevent themfrom falling apart and leaving a hole or depression, as in thedrier-felts now in common use.

Both Figs. l and 2 show the filling-threads separated much more thanthey would be in actual practice, as the fabric presents a hard firmsurface closely woven to act upon the damp paper-web.

Vhile I have shown the successive binderthreads as crossing each otherin directionthe preferable construction, as a firmer fabric is therebyproduced-still the binder-warps may all run in the same direction, as inlight weights of the felt or for shorter lengths.

Having fully described my invention, what I claim, and desire to secureby Letters Patent, is-

l. A drier-felt for paper-machines, consisting of two superposed pliesof double-face woven fabric having large face-Warps, said plies beingunited by smaller binder-Warps adjacent the under or inner sides of theface- Warps and buried under the said face-warps of the plies,substantially as described.

2. A drier-felt for paper-machines, consist ing of two superposed pliesof close-Woven double-face fabric having large face-warps, said pliesbeing'united by smaller binderwarps adjacent the under or inner sides ofthe faoe-Warps., the binder-warps passing from one to the other ply andburied under the said face-warps, successive binder-warps crossing eachother as they pass from one to the other ply, substantially asdescribed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

' WILLIAM L. DARRELL.

Witnesses:

GEO. W. GREGORY, MARGARET A. DUNN.

